Photosensitive resistance module Is most sensitive to ambient light. Module can be directly connected with Microcontrollers or to trigger relay module. Module sets output to LOW logic (on DO pin) if the light intensity is higher. The KY-018 is a photoresistor module — also known as an LDR (light-dependent resistor), photosensitive resistor, or light sensor module — that measures ambient light intensity. It can be used for various purposes, such as adjusting the brightness of a device, detecting day and night, or activating a light switch. We'll explore how the sensor detects different light levels and processes and displays these readings on the serial monitor. 3V–5V, it provides both analog and digital output. They are mainly used in: photocells, photo- multiplier tubes, photo-resistors, photo-transistors, solar cells, infrared sensors, ultraviolet sensors, fiber optic sensors, color sensors, CCDs, and CMOS image sensor, etc.
[PDF Version]